A multi-time scale coordinated frequency control method for a wind and fire baling and delivery system

Abstract

The present application relates to the field of wind and fire bundled delivery system, especially to a kind of wind and fire bundled delivery system's multi-time scale collaborative frequency modulation control method.First, based on the real-time operation data obtained, the wind and fire available up-regulation capacity and the wind and fire available down-regulation capacity are obtained, further combined with the real-time operation data obtained, the collaborative frequency modulation urgency index in the up-regulation direction and the collaborative frequency modulation urgency index in the down-regulation direction are obtained by collaborative frequency modulation urgency evaluation algorithm;Then, based on the collaborative frequency modulation urgency index in the up-regulation direction and the collaborative frequency modulation urgency index in the down-regulation direction, the wind power and the thermal power frequency modulation power instruction is automatically generated when the sending end bus frequency deviates from the rated frequency by wind and fire collaborative frequency modulation adaptive control algorithm;When the sending end bus frequency is equal to the rated frequency, collaborative frequency modulation instruction is not triggered.The technical problems that it is difficult to adjust corresponding different frequency state, cannot truly reflect the current callable frequency modulation resource, and frequency modulation allocation is prone to unreasonable are solved.

Description

Technical Field

[0001] This invention relates to the field of wind and fire bundled delivery systems, and more particularly to a multi-timescale coordinated frequency modulation control method for wind and fire bundled delivery systems. Background Technology

[0002] With the rapid growth of new energy installed capacity, the proportion of renewable energy such as wind power in the power system is constantly increasing, and bundled wind and thermal power transmission has become an important way for my country to develop and consume large-scale new energy. However, wind power output has obvious randomness, volatility, and uncertainty, which makes the frequency stability problem of bundled wind and thermal power transmission systems more prominent during operation. The traditional method of relying solely on thermal power units to undertake frequency regulation is no longer able to meet the operational needs of a high proportion of new energy power grids. Thermal power units have good continuous regulation capabilities, but their response speed is slow and they cannot cope with the power fluctuations caused by rapid changes in wind power output in a timely manner. Wind power units have faster power response capabilities and can participate in frequency regulation in a short time, but their adjustability is greatly affected by wind speed changes and their continuous regulation capability is insufficient. Therefore, relying solely on wind power or thermal power for frequency regulation has limitations, and a wind-thermal power coordinated frequency regulation approach is needed to achieve a complementary advantage of rapid response and continuous regulation. Existing frequency regulation methods mostly employ fixed-ratio allocation or simple power deviation allocation, failing to comprehensively consider frequency deviation, frequency change rate, and the real-time regulation capabilities of wind and thermal power units. This makes it difficult to dynamically reflect the urgency of system frequency regulation needs, leading to delayed response or unreasonable allocation of frequency regulation resources during frequency disturbances. Consequently, this affects the power stability of transmission channels and system operational safety, making it difficult to meet the frequency security control requirements of power systems under conditions of high-proportion renewable energy transmission. Therefore, there is an urgent need for a multi-timescale coordinated frequency regulation control method capable of real-time assessment of system frequency regulation urgency and adaptive allocation of wind and thermal power regulation tasks to improve the frequency stability and renewable energy absorption capacity of bundled wind and thermal power transmission systems. By constructing a more comprehensive multi-timescale coordinated frequency regulation control system, the flexibility and reliability of bundled wind and thermal power transmission systems can be improved, providing stronger technical support for the safe and stable operation of high-proportion renewable energy power grids. Summary of the Invention

[0003] This invention provides a multi-timescale coordinated frequency regulation control method for a wind-thermal bundled power transmission system to address the problems of lacking separate identification of the up and down directions, making it difficult to adjust according to different frequency states; lacking joint evaluation of wind power up and down regulation capabilities and thermal power ramping capabilities, failing to accurately reflect the currently available frequency regulation resources; and failing to coordinate the fast response of wind power with the slow and continuous characteristics of thermal power, easily leading to technical problems of unreasonable frequency regulation allocation.

[0004] The present invention provides a multi-time-scale coordinated frequency modulation control method for a wind-fire bundling and delivery system, comprising the following steps:

[0005] S1. Acquire real-time operating data, including the sending-end bus frequency, rated frequency, frequency change rate, measured power transmitted, planned power transmitted, available power for wind power upward regulation, available power for wind power downward regulation, data reporting cycle of the synchronous phasor measurement device, speed regulation execution cycle of thermal power units, and achievable ramp rate for both upward and downward regulation of thermal power. Multiply the speed regulation execution cycle of thermal power units by the achievable ramp rate for both upward and downward regulation of thermal power, and then combine this with the available power for both upward and downward regulation of wind power to obtain the available upward and downward regulation capabilities of wind and thermal power. Based on the acquired real-time operating data, combined with the available upward and downward regulation capabilities of wind and thermal power, obtain the coordinated frequency regulation urgency index in the upward direction and the coordinated frequency regulation urgency index in the downward direction through the coordinated frequency regulation urgency assessment algorithm.

[0006] S2. Based on the urgency index of coordinated frequency regulation in the upward and downward directions, the wind-thermal coordinated frequency regulation adaptive control algorithm automatically generates frequency regulation power commands for wind power and thermal power when the sending-end bus frequency deviates from the rated frequency; when the sending-end bus frequency is equal to the rated frequency, the coordinated frequency regulation command is not triggered.

[0007] Preferably, S1 specifically includes:

[0008] In the coordinated frequency modulation urgency assessment algorithm, based on the sending-end bus frequency, rated frequency, frequency change rate, measured power transmitted and planned power transmitted, directionality is identified and decomposed, and low-frequency deviation, high-frequency deviation, negative frequency change rate, positive frequency change rate, power shortage and power excess transmitted are calculated.

[0009] Preferably, S1 specifically includes:

[0010] Dividing the power shortage by the available upward adjustment capacity of wind and thermal power yields the power urgency term in the upward adjustment direction; dividing the power surplus by the available downward adjustment capacity of wind and thermal power yields the power urgency term in the downward adjustment direction.

[0011] Preferably, S1 specifically includes:

[0012] The low-frequency deviation is combined with the negative frequency change rate to obtain the frequency urgency term in the upward direction; the high-frequency deviation is combined with the positive frequency change rate to obtain the frequency urgency term in the downward direction; the frequency urgency terms in the upward and downward directions are normalized respectively to obtain the normalized frequency urgency terms in the upward and downward directions.

[0013] Preferably, S1 specifically includes:

[0014] The normalized frequency urgency term is superimposed with the corresponding power urgency term to obtain the coordinated frequency modulation urgency index in the upward direction and the coordinated frequency modulation urgency index in the downward direction, respectively.

[0015] Preferably, S2 specifically includes:

[0016] In the wind-thermal coordinated frequency regulation adaptive control algorithm, the frequency dynamic characteristic components in the upward and downward directions are calculated based on low-frequency deviation, negative frequency change rate, high-frequency deviation, and positive frequency change rate, respectively. Based on the available power for wind power upward regulation, the available upward regulation capacity of wind and thermal power, the available downward regulation capacity of wind power, and the available downward regulation capacity of wind and thermal power, the regulation capacity components in the upward and downward directions are calculated, respectively.

[0017] Preferably, S2 specifically includes:

[0018] The frequency dynamic characteristic component is multiplied by the corresponding regulation capability component to calculate the fast response up-adjustment allocation coefficient and the fast response down-adjustment allocation coefficient.

[0019] Preferably, S2 specifically includes:

[0020] By dividing the coordinated frequency regulation urgency index by 1 and adding the coordinated frequency regulation urgency index, the frequency regulation urgency mapping factors for the upward and downward directions are calculated respectively. The frequency regulation urgency mapping factor for the upward direction, the available wind and thermal power upward regulation capacity, and the upward regulation fast response allocation coefficient are multiplied to obtain the wind power upward regulation command. The frequency regulation urgency mapping factor for the downward direction, the available wind and thermal power downward regulation capacity, and the downward regulation fast response allocation coefficient are multiplied to obtain the wind power downward regulation command.

[0021] Preferably, S2 specifically includes:

[0022] The thermal power power increase command is calculated by multiplying the frequency regulation urgency mapping factor, the available wind and thermal power increase capacity, and the complementary ratio corresponding to the fast response allocation coefficient for the upward adjustment direction; the thermal power power decrease command is calculated by multiplying the frequency regulation urgency mapping factor, the available wind and thermal power decrease capacity, and the complementary ratio corresponding to the fast response allocation coefficient for the downward adjustment direction.

[0023] The beneficial effects of the technical solution of the present invention are:

[0024] 1. Introduce a collaborative frequency regulation urgency assessment algorithm to comprehensively analyze multi-dimensional operational information such as frequency deviation, frequency change rate, and power transmission deviation. This enables real-time quantitative assessment of frequency regulation demand intensity and resource scarcity, thereby accurately identifying the direction of frequency regulation demand and the urgency of regulation in different operating states of the wind-thermal bundled power transmission system. This improves the pertinence and real-time performance of frequency regulation, enhances the frequency stability capability of the sending-end power grid, and improves the safe operation level of the wind-thermal bundled power transmission system.

[0025] 2. By directionally identifying and decomposing frequency deviation, frequency change rate, and external power deviation, and coupling analysis of static frequency deviation and dynamic frequency change trend, and combining the available up-adjustment and down-adjustment capabilities of wind and thermal power, a coordinated frequency modulation urgency index is constructed to achieve multi-time-scale information fusion frequency modulation control. This enables early identification of frequency fluctuation trends, improves the response capability to frequency disturbances, reduces the amplitude of frequency fluctuations, and improves the dynamic stability level of the wind and thermal power bundled external transmission system.

[0026] 3. By introducing the available power of wind power to be adjusted upwards, the available power of wind power to be adjusted downwards, the ramp-up capability of thermal power to be adjusted downwards, and the ramp-up capability of thermal power to be adjusted upwards, a wind-thermal power availability adjustment capability assessment mechanism is constructed. This mechanism is then normalized with the power transmission deficit or surplus, enabling collaborative modeling of the rapid adjustment capability of wind power and the continuous adjustment capability of thermal power. This allows for full utilization of the rapid response advantage of wind power and the continuous support advantage of thermal power, improving the efficiency of wind and thermal power resource utilization, enhancing the overall frequency regulation capability, and reducing the frequency regulation burden of a single power source.

[0027] 4. Through the wind-thermal coordinated frequency regulation adaptive control algorithm, the fast response allocation coefficients for upward and downward regulation are calculated based on the frequency change rate and frequency deviation. Combined with the proportion of wind power adjustable capacity in the total upward regulation capacity, wind power and thermal power frequency regulation power commands are generated. This enables multi-timescale coordinated control where wind power undertakes the task of rapid regulation and thermal power undertakes the task of continuous regulation, thereby improving the frequency regulation response speed and continuous regulation capability, and shortening the frequency recovery time. Attached Figure Description

[0028] Figure 1 This is a flowchart of a multi-timescale coordinated frequency modulation control method for a wind and fire bundling and delivery system according to the present invention. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] The following description, in conjunction with the accompanying drawings, details the specific scheme of a multi-timescale coordinated frequency modulation control method for a wind-fire bundling and delivery system provided by the present invention.

[0032] See attached document Figure 1 The diagram illustrates a multi-time-scale coordinated frequency modulation control method for a wind-fire bundling and delivery system according to an embodiment of the present invention. The method includes the following steps:

[0033] S1. Acquire real-time operating data, including the sending-end bus frequency, rated frequency, frequency change rate, measured power transmitted, planned power transmitted, available power for wind power upward regulation, available power for wind power downward regulation, data reporting cycle of the synchronous phasor measurement device, speed regulation execution cycle of thermal power units, and achievable ramp rate for both upward and downward regulation of thermal power. Multiply the speed regulation execution cycle of thermal power units by the achievable ramp rate for both upward and downward regulation of thermal power, and then combine this with the available power for both upward and downward regulation of wind power to obtain the available upward and downward regulation capabilities of wind and thermal power. Based on the acquired real-time operating data, combined with the available upward and downward regulation capabilities of wind and thermal power, obtain the coordinated frequency regulation urgency index for the upward regulation direction and the coordinated frequency regulation urgency index for the downward regulation direction through a coordinated frequency regulation urgency assessment algorithm.

[0034] Obtain real-time runtime data, specifically, during scheduling. Simultaneously, the system collects sending-end operating status data, including sending-end bus frequency, frequency change rate, measured power transmitted, planned power transmitted, available power for wind power regulation (upward adjustment), available power for wind power regulation (downward adjustment), achievable ramp rate for thermal power regulation (upward adjustment), and achievable ramp rate for thermal power regulation (downward adjustment). It also reads time parameters such as the data reporting cycle of the synchronous phasor measurement device and the speed regulation execution cycle of thermal power units. The rated frequency is directly determined from the grid standard parameters. .

[0035] Collect sending-end operating status data, specifically including: sending-end bus frequency. Current dispatch time of the grid-connected bus at the sending end The real-time frequency value is directly acquired by the synchronous phasor measurement device or frequency measurement device configured at the sending-end substation or collecting station; frequency change rate Refers to the current scheduling time The rate of change of frequency over time reflects whether the frequency is deteriorating rapidly or shifting slowly, and can be directly provided by a synchronous phasor measurement device; external measured power. Refers to the current scheduling time The active power actually transmitted by the sending end through the external transmission channel is obtained by direct measurement using voltage and current transformers, and the power value is calculated accordingly; the planned external transmission power... Refers to the current scheduling time The required target power for external transmission can be directly read from the planned curve issued by the energy management system or dispatch center, such as the planned power transmission curve; the available power for wind power adjustment. Refers to the current scheduling time The active power margin that a wind farm can continue to increase is used to characterize the rapid adjustment capability that a wind farm can immediately utilize when participating in frequency regulation. It can be obtained from the difference between the wind farm's current actual generated power and its short-term maximum generated power. The current actual generated power comes from the monitoring and control devices or metering devices at the wind farm's substation grid connection point. This is achieved by collecting three-phase voltage, current, and power factor data to calculate the active power delivered by the wind farm to the grid in real time. The short-term maximum generated power comes from the wind farm power prediction system. This system is a professional prediction system used to calculate and evaluate the future generated power of a wind farm. By integrating meteorological forecast data, wind turbine operating status data, and historical wind farm operating data, it predicts the available wind energy resources and generating capacity of the wind farm in the short term. The meteorological forecast data comes from the National Meteorological Center's weather forecast system, while the wind turbine operating status data and historical wind farm operating data come from the wind farm monitoring and data acquisition system. The achievable ramp rate for thermal power regulation is... Refers to the thermal power unit during the dispatching time The achievable upward speed of power generation is used to characterize the continuous upward adjustment capability of thermal power units within a short period of time. This can be achieved using existing real-time ramp-up capability parameters, load response capability parameters, or ramp-up limits stored on the dispatch side within the thermal power unit control system; the available power for wind power downward adjustment... Refers to the current scheduling time The active power margin that a wind farm can continue to adjust downwards is used to characterize the rapid load shedding capability that the wind farm can immediately utilize when participating in frequency regulation downsampling. It reflects the downward adjustment space that the wind farm can still release under the current operating state, and can be obtained from the difference between the wind farm's current actual generated power and the wind farm's minimum allowable active power output. The wind farm's minimum allowable active power output comes from the lower limit setting value in the wind farm's active power control system or the current minimum operating output value of the wind turbine group; the downsampling rate achievable by thermal power is... Refers to the thermal power unit during the dispatching time The achievable downward reduction rate is used to characterize the continuous downward adjustment capability of a thermal power unit in a short period of time. It can be based on existing real-time downward ramping capability parameters, unit load response capability parameters, or unit downward ramping limits stored on the dispatch side in the thermal power unit control system.

[0036] After acquiring real-time operational data, a coordinated frequency regulation urgency assessment algorithm is introduced to obtain a coordinated frequency regulation urgency index that reflects the current frequency regulation demand intensity and resource scarcity of the wind-fire bundled power transmission system.

[0037] The directional identification of the operating status of the wind-fire bundled power transmission system is performed; specifically, the frequency of the sending-end bus is calculated. With rated frequency The difference is used to obtain the frequency deviation. By comparing the sending-end bus frequency with the rated frequency, the frequency deviation is divided into two directional components: low-frequency deviation and high-frequency deviation. When the sending-end bus frequency is lower than the rated frequency, a low-frequency deviation is considered to exist, reflecting insufficient active power supply in the combined wind and fire power transmission system. When the sending-end bus frequency is higher than the rated frequency, a high-frequency deviation is considered to exist, reflecting excess active power in the combined wind and fire power transmission system. Through directional division, two different adjustment needs, upward and downward adjustment, can be distinguished.

[0038] After completing the directionality identification, the frequency change rate is further decomposed directionally: when the frequency change rate is negative, it indicates that the frequency is decreasing; when the frequency change rate is positive, it indicates that the frequency is increasing; when the frequency change rate is equal to 0, the frequency is in a stable state, neither increasing nor decreasing. By performing directional decomposition on the frequency change rate, the dynamic characteristics of the current disturbance can be reflected, so that the urgency of frequency modulation depends not only on the magnitude of the frequency deviation, but also on the frequency change trend.

[0039] Subsequently, by calculating the difference between the actual transmitted power and the planned transmitted power, the transmitted power deviation, including the transmitted power shortfall, is obtained. and excessive external power The deviation of transmitted power is decomposed directionally: when the actual transmitted power is lower than the planned transmitted power, it is considered that there is a power shortage and the active power output needs to be increased; when the actual transmitted power is higher than the planned transmitted power, it is considered that there is an excess of transmitted power and the active power output needs to be reduced; when the actual transmitted power is equal to the planned transmitted power, that is, when the power deviation is 0, it means that the transmitted power is executed completely according to plan.

[0040] Furthermore, the urgency of coordinated frequency modulation in both the upward and downward directions is established.

[0041] For the upward adjustment direction, the low-frequency deviation is combined with the negative frequency change rate to form a frequency urgency term that reflects the severity of the low frequency. This reflects the superposition effect of static frequency deviation and dynamic frequency change trend. When the low-frequency deviation is larger or the negative frequency change rate is faster, it indicates that the frequency adjustment demand is more urgent. The frequency urgency term is normalized with the rated frequency to obtain the normalized frequency urgency term for the upward adjustment direction.

[0042] After obtaining the frequency urgency term normalized for the upward adjustment direction, a power urgency term is further introduced, using the sum of the available upward adjustment power from wind power and the upward adjustment ramping capacity of thermal power as the normalization benchmark. The power urgency term characterizes the relative magnitude of the current power transmission deficit relative to the available upward adjustment capacity from wind and thermal power. The power transmission deficit represents the amount of active power deficiency to be compensated, and the sum of the available upward adjustment power from wind power and the upward adjustment ramping capacity of thermal power represents the total amount of upward adjustment capacity that can be actually mobilized, i.e., the available upward adjustment capacity from wind and thermal power. When the power transmission deficit is larger or the available upward adjustment capacity from wind and thermal power is smaller, the power urgency term is larger, indicating a greater pressure for power compensation in the upward adjustment direction; when the power transmission deficit is smaller or the available upward adjustment capacity from wind and thermal power is more sufficient, the power urgency term is smaller, indicating a less pressure for power compensation in the upward adjustment direction.

[0043] Similarly, in the downward adjustment direction, the high-frequency deviation is combined with the positive frequency change rate to form a frequency urgency term reflecting the severity of the high-frequency fluctuations. This term is then normalized to the rated frequency to obtain the normalized frequency urgency term for the downward adjustment direction. Subsequently, the excess power transmitted to external sources is normalized to the sum of the available power for wind power downward adjustment and the ramp-up capability for thermal power downward adjustment to obtain the power urgency term for the downward adjustment direction.

[0044] By superimposing the normalized frequency urgency term and the power urgency term, we obtain the coordinated frequency modulation urgency index in the upward direction and the coordinated frequency modulation urgency index in the downward direction, respectively.

[0045] The formula for calculating the urgency index of coordinated frequency modulation in the upward direction is:

[0046]

[0047] in, Indicates scheduling time The urgency index of coordinated frequency modulation in the direction of time adjustment; This indicates the frequency-critical term for upward adjustment direction normalization. The frequency urgent term indicating the upward adjustment direction is expressed in Hertz (Hz). Indicates scheduling time Low-frequency deviation, expressed in Hertz (Hz); This indicates the data reporting period of the synchronous phasor measurement device, in seconds (s). Indicates scheduling time The negative frequency change rate at that time The unit is Hertz per second (Hz / s); Indicates the rated frequency, in Hertz (Hz); Indicates the power urgent item in the upward direction; This indicates the power deficit in external transmission, expressed in watts (W). Indicates scheduling time The available wind power capacity at that time is adjusted upwards, in watts (W). This indicates the ramp-up capability of thermal power plants, measured in watts (W). This indicates the speed regulation execution cycle of the thermal power unit, in seconds (s). This indicates the achievable ramp rate for thermal power plants, expressed in watts per second (W / s). This indicates that the wind and fire elements can be upgraded, and the unit is watts (W).

[0048] The formula for calculating the urgency index of coordinated frequency modulation in the downward direction is:

[0049]

[0050] in, Indicates scheduling time The urgency index for coordinated frequency modulation in the current direction adjustment; This indicates the frequency-critical term for downward adjustment direction normalization. The frequency urgent term indicating the downward adjustment direction is expressed in Hertz (Hz). Indicates scheduling time The high-frequency deviation at that time is expressed in Hertz (Hz). Indicates scheduling time The positive frequency change rate at time, The unit is Hertz per second (Hz / s); The power urgent item indicates the downward adjustment direction; This indicates that the external power transmission is excessive, and the unit is watts (W). Indicates scheduling time The available wind power capacity at that time was reduced, in watts (W). This indicates the reduced ramp-up capability of thermal power plants, measured in watts (W). This indicates the achievable ramp rate for thermal power plants, expressed in watts per second (W / s). This indicates that the ability to reduce the power of wind and fire can be reduced, and the unit is watts (W).

[0051] S2. Based on the urgency index of coordinated frequency regulation in the upward and downward directions, the wind-thermal coordinated frequency regulation adaptive control algorithm automatically generates frequency regulation power commands for wind power and thermal power when the sending-end bus frequency deviates from the rated frequency; when the sending-end bus frequency is equal to the rated frequency, the coordinated frequency regulation command is not triggered.

[0052] Based on the urgency indicators of coordinated frequency regulation in the upward and downward directions, the wind-thermal coordinated frequency regulation adaptive control algorithm automatically generates frequency regulation power commands for wind power and thermal power when the sending-end bus frequency deviates from the rated frequency, i.e., there is a low-frequency deviation or a high-frequency deviation, thereby achieving adaptive coordinated allocation control for rapid support and continuous adjustment.

[0053] When a low-frequency deviation exists, indicating low-frequency operation, the rapid response allocation coefficient for upward adjustment is calculated based on the frequency change rate and the low-frequency deviation. This coefficient consists of two parts: the frequency dynamic characteristic component in the upward adjustment direction and the adjustment capability component in the upward adjustment direction. The frequency dynamic characteristic component in the upward adjustment direction reflects the urgency of the current frequency change trend. When the frequency change rate is large, faster response resources are needed for adjustment. Since wind turbines have a faster power response capability, the higher the proportion of the frequency change rate, the greater the proportion of frequency regulation undertaken by wind power. Conversely, when the frequency change is slow but the frequency deviation is large, it is more suitable for thermal power units to undertake the continuous frequency regulation task. The adjustment capability component in the upward adjustment direction describes the proportion of wind power adjustable capacity in the total upward adjustment capacity. The total upward adjustment capacity, i.e., the wind-thermal available upward adjustment capacity, consists of wind power adjustable capacity and thermal power upward adjustment ramping capacity. Wind power adjustable capacity is determined by the available wind power for upward adjustment, while thermal power upward adjustment ramping capacity is determined by the ramping capacity achievable by the thermal power unit within the control cycle. When wind power has a greater adjustable capacity, it indicates that wind power has a higher potential for rapid adjustment. In this case, wind power undertakes a higher proportion of frequency regulation tasks. When thermal power has a greater ability to climb the frequency curve, thermal power undertakes more frequency regulation tasks.

[0054] Similarly, when there is a high-frequency deviation, i.e. when the system is in a high-frequency operating state, the fast response allocation coefficient is adjusted downward based on the frequency change rate and the high-frequency deviation.

[0055] The formula for calculating the upward adjustment of the fast response allocation coefficient is as follows:

[0056]

[0057] in, Indicates scheduling time Adjust the rapid response allocation coefficient at that time; Indicates scheduling time Low-frequency deviation at that time; Indicates scheduling time The frequency dynamic characteristic component of the upward adjustment direction at that time; This indicates the adjustable capacity of wind power, that is, the usable power that can be adjusted upwards from the wind power source; Indicates scheduling time The component of the upward adjustment direction at that time; Indicates scheduling time The total ability to be increased at any time, that is, the ability to be increased by wind and fire.

[0058] The formula for calculating the reduction of the fast response allocation coefficient is as follows:

[0059]

[0060] in, Indicates scheduling time Adjust the rapid response allocation coefficient at that time; Indicates scheduling time High-frequency deviation at time; Indicates scheduling time The frequency dynamic characteristic component of the downward adjustment direction at that time; Indicates scheduling time The adjustment capability component in the downward direction at that time.

[0061] When low-frequency deviations exist, power increase commands for wind and thermal power are generated based on the coordinated frequency regulation urgency index and the rapid response allocation coefficient for the upward adjustment direction. First, the current total upward adjustment capacity is calculated, consisting of the available power for wind power and the ramp-up capacity of thermal power. Next, by multiplying the rapid response allocation coefficient for the upward adjustment by the current total upward adjustment capacity, the proportion of regulation capacity undertaken by wind power can be obtained. This is then corrected using a frequency regulation urgency mapping factor for the upward adjustment direction to obtain the wind power upward adjustment command. The complementary ratio corresponding to the rapid response allocation coefficient for the upward adjustment is the allocation ratio for thermal power to undertake the continuous upward adjustment task. By multiplying the complementary ratio corresponding to the rapid response allocation coefficient for the upward adjustment by the current total upward adjustment capacity, the proportion of regulation capacity undertaken by thermal power can be obtained. This is then corrected using a frequency regulation urgency mapping factor for the upward adjustment direction to obtain the thermal power upward adjustment command.

[0062] The formula for calculating the wind power increase command is as follows:

[0063]

[0064] in, Indicates scheduling time The wind power power increase command at that time, in watts (W); Indicates scheduling time The total ability to be increased at any time, that is, the ability to be increased by wind and fire. Indicates scheduling time Frequency modulation urgency mapping factor in the up-adjustment direction; This indicates the proportion of regulation capacity undertaken by wind power in the upward direction, expressed in watts (W).

[0065] The formula for calculating the power increase order for thermal power plants is:

[0066]

[0067] in, Indicates scheduling time The power increase command for thermal power plants at that time is expressed in watts (W). This indicates the complementary ratio corresponding to the increase in the rapid response allocation coefficient, that is, the allocation ratio of thermal power to undertake the task of continuous increase; This indicates the proportion of regulation capacity undertaken by thermal power plants in the upward direction, expressed in watts (W).

[0068] Similarly, when there is a high-frequency deviation, the power reduction command for wind power and thermal power is generated based on the urgency index of coordinated frequency regulation in the down-regulation direction and the down-regulation fast response allocation coefficient.

[0069] The formula for calculating the wind power reduction command is as follows:

[0070]

[0071] in, Indicates scheduling time The wind power reduction command at that time, in watts (W); Indicates scheduling time The total capacity for reduction at that time is expressed in watts (W). Indicates scheduling time The current urgency mapping factor for adjusting the direction of frequency modulation; This indicates the proportion of regulation capacity undertaken by wind power in the downward direction, expressed in watts (W).

[0072] The formula for calculating the power reduction order for thermal power plants is:

[0073]

[0074] in, Indicates scheduling time The power reduction order for thermal power plants at that time, in watts (W); This indicates the complementary ratio corresponding to the reduction of the fast response allocation coefficient; This indicates the proportion of regulation capacity undertaken by thermal power plants in the downward direction, expressed in watts (W).

[0075] When the sending-end bus frequency is equal to the rated frequency, the coordinated frequency modulation command is not triggered.

[0076] In summary, a multi-timescale coordinated frequency modulation control method for a wind-fire bundled delivery system has been developed.

[0077] The order of the embodiments is for illustrative purposes only and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0078] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A multi-time-scale coordinated frequency modulation control method for a wind-fire bundled delivery system, characterized in that, Includes the following steps: S1. Acquire real-time operational data, including the sending-end bus frequency, rated frequency, frequency change rate, measured power transmitted, planned power transmitted, available power for wind power regulation, available power for wind power regulation, data reporting cycle of the synchronous phasor measurement device, speed regulation execution cycle of thermal power units, and achievable ramp rates for both wind power regulation and regulation. Multiply the speed regulation execution cycle of thermal power units by the achievable ramp rates for both wind power regulation and regulation, and combine this with the available power for both wind power regulation and regulation to obtain the available upward and downward regulation capabilities of wind and thermal power. Based on the acquired real-time operational data, combined with the available upward and downward regulation capabilities of wind and thermal power, use a coordinated frequency regulation urgency assessment algorithm to perform directional identification on the sending-end bus frequency, rated frequency, frequency change rate, measured power transmitted, and planned power transmitted. The process involves decomposition and calculation of low-frequency deviation, high-frequency deviation, negative frequency change rate, positive frequency change rate, power deficit, and power surplus. The power deficit is divided by the available wind and thermal regulation capacity to obtain the power urgency term in the upward direction. The power surplus is divided by the available wind and thermal regulation capacity to obtain the power urgency term in the downward direction. The low-frequency deviation is combined with the negative frequency change rate to obtain the frequency urgency term in the upward direction. The high-frequency deviation is combined with the positive frequency change rate to obtain the frequency urgency term in the downward direction. The frequency urgency terms in the upward and downward directions are normalized to obtain normalized frequency urgency terms in the upward and downward directions. The normalized frequency urgency terms are superimposed with the corresponding power urgency terms to obtain the coordinated frequency regulation urgency index in the upward and downward directions, respectively. S2. Based on the urgency index of coordinated frequency regulation in the upward and downward directions, the wind-thermal coordinated frequency regulation adaptive control algorithm automatically generates frequency regulation power commands for wind power and thermal power when the sending-end bus frequency deviates from the rated frequency; when the sending-end bus frequency is equal to the rated frequency, the coordinated frequency regulation command is not triggered.

2. The multi-timescale coordinated frequency modulation control method for a wind-fire bundling and delivery system according to claim 1, characterized in that, S2 specifically includes: In the wind-thermal coordinated frequency regulation adaptive control algorithm, the frequency dynamic characteristic components in the upward and downward directions are calculated based on low-frequency deviation, negative frequency change rate, high-frequency deviation, and positive frequency change rate, respectively. Based on the available power for wind power upward regulation, the available upward regulation capacity of wind and thermal power, the available downward regulation capacity of wind power, and the available downward regulation capacity of wind and thermal power, the regulation capacity components in the upward and downward directions are calculated, respectively.

3. The multi-time-scale coordinated frequency modulation control method for a wind-fire bundling and delivery system according to claim 2, characterized in that, S2 specifically includes: The frequency dynamic characteristic component is multiplied by the corresponding regulation capability component to calculate the fast response up-adjustment allocation coefficient and the fast response down-adjustment allocation coefficient.

4. The multi-time-scale coordinated frequency modulation control method for a wind-fire bundling and delivery system according to claim 3, characterized in that, S2 specifically includes: By dividing the coordinated frequency regulation urgency index by 1 and adding the coordinated frequency regulation urgency index, the frequency regulation urgency mapping factors for the upward and downward directions are calculated respectively. The frequency regulation urgency mapping factor for the upward direction, the available wind and thermal power upward regulation capacity, and the upward regulation fast response allocation coefficient are multiplied to obtain the wind power upward regulation command. The frequency regulation urgency mapping factor for the downward direction, the available wind and thermal power downward regulation capacity, and the downward regulation fast response allocation coefficient are multiplied to obtain the wind power downward regulation command.

5. The multi-time-scale coordinated frequency modulation control method for a wind-fire bundling and delivery system according to claim 4, characterized in that, S2 specifically includes: The thermal power power increase command is calculated by multiplying the frequency regulation urgency mapping factor, the available wind and thermal power increase capacity, and the complementary ratio corresponding to the fast response allocation coefficient for the upward adjustment direction; the thermal power power decrease command is calculated by multiplying the frequency regulation urgency mapping factor, the available wind and thermal power decrease capacity, and the complementary ratio corresponding to the fast response allocation coefficient for the downward adjustment direction.

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